Gray-zone coercion tests Taiwan's legal and institutional readiness

A 2026 Taiwan Strait security tabletop exercise highlighted how China's gray-zone tactics could exploit gaps in Taiwan's legal authority, operational procedures and international messaging before open conflict begins.

Gray-zone coercion operates in the space between routine statecraft and armed conflict, using actions calibrated to avoid triggering a major military response. For Beijing, that ambiguity can be used to alter the status quo incrementally while complicating Taiwan's response and shifting the perceived burden of escalation onto Taipei.

One of the central scenarios examined in the 2026 Taiwan Strait Security Tabletop Exercise focused on Taiwan's response to escalating gray-zone coercion. Rather than simulating open warfare, the exercise considered how China could combine legal ambiguity, maritime pressure, drone incidents and large-scale military exercises to pressure Taiwan without crossing an obvious threshold into armed conflict.

The hypothetical scenario included Beijing declaring a so-called "Peaceful Unification Demonstration Zone" around Kinmen and Matsu, Chinese vessels obstructing and forcibly towing Taiwanese coast guard vessels, a collision between a Chinese drone and a Taiwanese aircraft, and a prolonged anti-access/area-denial, or A2/AD, encirclement exercise intended to simulate blockade-like conditions.

Together, the scenarios highlighted vulnerabilities that extend beyond the military domain to Taiwan's legal frameworks, administrative procedures and ability to shape international perceptions.

Exploiting ambiguity below the threshold of war

China's gray-zone approach seeks to avoid actions that can be readily classified as acts of war.

A declaration of a "demonstration zone" around Kinmen and Matsu, for example, could be portrayed by Beijing as an exercise of domestic governance or peaceful integration rather than external aggression. Coast guard obstruction could be characterized as law enforcement, while a drone incident could be framed as an accident, technical malfunction or disputed event.

A large-scale encirclement exercise could likewise be presented as routine military training rather than a blockade. Such framing could complicate Taiwan's response and make it more difficult for international partners to reach a common assessment of the situation.

Kinmen and Matsu as potential pressure points

Kinmen and Matsu illustrate this vulnerability with particular clarity. Their proximity to China and their position as Taiwan-controlled offshore islands close to the Chinese coast make them potential targets for coercive pressure.

The Taiwan Relations Act defines "Taiwan" for the purposes of the law as including the island of Taiwan and the Penghu Islands, without specifically including Kinmen and Matsu. The law also does not provide Taiwan with an automatic U.S. military defense guarantee.

That ambiguity could give Beijing room to apply geographically limited pressure while seeking to avoid provoking a broader confrontation. By expanding and normalizing Chinese activity around the islands, Beijing could attempt to weaken Taiwan's effective jurisdiction without immediately triggering a wider crisis.

The gray-zone scenario suggested Taiwan's first challenge is not simply deciding how to respond after an incident occurs. It is establishing the legal authority, procedures and chains of command needed before a crisis begins.

Frontline personnel, including coast guard officers and aviation officials, could face rapidly evolving situations without sufficient legal authority, procedural guidance or political backing.

That creates two competing risks: hesitation that allows Chinese coercion to succeed, or an excessive response that gives Beijing an opportunity to portray Taiwan as the party responsible for escalation.

A forced towing incident involving Taiwanese coast guard vessels, for instance, would require immediate decisions about pursuit, warnings, resistance and documentation. Without clear rules of engagement and legal guidance, personnel may be left to improvise under pressure.

Similarly, a collision involving a Chinese drone and a Taiwanese aircraft would raise questions about intent, responsibility, evidence collection and escalation control. Taiwan would need to protect aviation safety and its jurisdiction while limiting opportunities for Beijing to portray the incident as Taiwanese provocation.

When an exercise resembles a blockade

The prolonged A2/AD encirclement scenario presents a different but related challenge. A 14-day encirclement exercise could fall short of a formally declared blockade while producing some of the same practical effects.

It could disrupt shipping, raise insurance costs, create public anxiety, strain energy and supply chains, and test the willingness of international partners to respond. How Taiwan and other governments classify such an operation could therefore affect the scale and speed of the international response.

If the situation is treated merely as a military exercise, that response may remain limited. Characterizing it as coercive interference with navigation, commerce and regional stability could strengthen Taiwan's case for international diplomatic support.

Controlling the narrative

Strategic communication would also be central to Taiwan's response. China's gray-zone tactics can rely on establishing a favorable interpretation of an incident before Taiwan and its partners reach their own conclusions.

If Chinese actions are accepted as domestic law enforcement, administrative measures or routine military activity, Taiwan's ability to generate international support could be weakened. Taiwan would therefore need to explain the international implications of an incident early, including its effects on freedom of navigation, aviation safety and regional stability.

At the same time, Taiwan would need to avoid responses that could appear disproportionate or escalatory.

The challenge is to respond firmly enough to resist the normalization of coercion while remaining proportionate and legally defensible. That requires Taiwan to establish its legal positions, operational thresholds and communication strategies before a crisis occurs.

Building support before an incident

The scenario also highlighted the importance of coalition-building before a crisis. Taiwan cannot assume that international actors will automatically interpret a gray-zone incident in the same way Taipei does, particularly if Beijing portrays it as a localized or internal matter.

Taiwan should therefore cultivate sustained dialogue with partners that have commercial, security and legal interests in stability across the Taiwan Strait. That could include governments concerned about shipping, aviation, supply chains and coercive activity below the threshold of armed conflict.

The immediate objective would not necessarily be military commitments, but a shared understanding of the legal, economic and security implications of potential Chinese actions before a crisis tests those relationships.

Legal clarity as deterrence

The exercise ultimately points to institutional preparedness as a key element of deterrence. Taiwan requires clearer legal frameworks for gray-zone incidents, including rules of engagement for coast guard and military personnel, procedures for drone and aircraft collisions, and defined authorities for responding to maritime and airspace disputes.

It should also develop negotiating plans, crisis communication templates, evidence-collection procedures and interagency decision-making protocols. These measures could reduce uncertainty for frontline personnel and make Taiwan's responses more consistent, lawful and credible.

Gray-zone coercion is most effective when uncertainty forces the target to improvise. Legal clarity, institutional coordination and strategic communication should therefore be treated as elements of Taiwan's defense planning rather than secondary administrative concerns.

The broader risk is not only military escalation, but the gradual erosion of Taiwan's authority before open conflict begins. Preparing legal frameworks, clarifying operational authority, establishing crisis procedures and building international understanding in advance could reduce the ambiguity Beijing seeks to exploit.